White Rodgers 1A66, 1A66W User Manual
WHITE-RODGERS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
The Type 1A66/1A66W Electric Heat Thermostat is designed for use on all types of electrical heating installations such as cable heat, baseboards, wall insert heaters,
etc. Its narrow operating differential and the ability of its
fully exposed knob to sense both radiant heat and room
air temperature make this control ideal for use on such
installations.
The Type 1A66/1A66W is intended for use on 240 or 277
volts where local codes require that a double line disconnect thermostat be used.
Dial Setting: Knob may be set anywhere between 40°
and 85°F by simply turning knob so that indicator on knob
points to the desired setting.
The knob may be turned past 40° to the “OFF” position to
obtain temporary shutdown of the heating equipment for
short periods of time such as on weekends, vacation, etc.
Turning knob to “OFF” position will break both sides of line.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting components could cause the control to malfunction. Take care
not to push or damage the knob sensing element
during installation.
CAUTION
To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
main fuse or circuit breaker box, until installation
is complete.
1A66/1A66W
ELECTRIC-HEAT THERMOSTAT
(Double Line Disconnect)
INST ALLA TION INSTRUCTIONS
DESCRIPTION
NOTE: Only one side of line is broken during normal cycling of
this thermostat.
60
70
50
All wiring must conform to local and national electrical
codes and ordinances.
WARNING
Do not use on circuits exceeding specified voltages. Higher voltages will damage control and
could cause shock or fire hazard.
Do not use on inductive loads. Inductive (motor)
loads will damage control and could cause shock
or fire hazard.
80
OFF
PRECAUTIONS
Switch Rating: Non-Inductive
22A (5000W) 240VAC
18A (5000W) 277VAC
If the heating equipment manufacturer has made provisions or recommendations for the location of this control,
then follow those instructions. If not, the following suggestions should be observed.
1. The control should be mounted in the wall, approximately five feet from the floor, as near as possible to
the centre of the controlled area.
2. It should be mounted on a partitioning wall, not on an
outside wall.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS RD., ST. LOUIS, MO. 63123
(314) 577-1300, Fax (314) 577-1517
9999 HWY. 48, MARKHAM, ONT. L3P 3J3
(905) 475-4653, FAX (905) 475-4625
R
Printed in U.S.A.
Temperature Range: 40° to 85°F
SPECIFICATIONS
Differential: 1°F
Switch Action: Open on rise
Contact Structure: Double Line Disconnect - DPST
INSTALLATION
3. It should be mounted as far as possible from undesirable sources of heat and cold such as:
a. Windows and doors
b. Direct rays from sun
c. Hot water or cold water pipes
d. Adjoining outside walls
PART NO. 37-5428C
Replaces 37-5428B
9724
WIRING
All wiring must conform to local and national electrical codes and ordinances.
The thermostat may be mounted in any standard 2" x 3"
electrical outlet box. For ease of installation use a deep
type box.
CAUTION
USE WITH COPPER CONDUCTORS ONLY.
1. Make electrical connection to thermostat leads with
wire nuts or other local code approved devices. All
Note: Do not
push on this knob
because calibration
will be changed
if knob is bent.
BLUE
BLUE
BLACK
BLACK
LOAD
connections must be tight.
2. Push the lead wires into the outlet box and mount the
thermostat to the outlet box with screws provided.
Take care not to push or damage the knob sensing element during installation.
3. Snap on the thermostat cover and turn knob to
desired setting.
Thermostat
Mounting Screw
60
70
50
80
LINE
LINE
Note: Breaks both sides of line in “OFF” position
Mounting Screw
Cover
2
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